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Question

How does isotope contradict Dalton theory?

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Solution

According to Dalton's theory, all atoms of an element are similar in all respects, for example they have the same shape, size etc, and have similar physical and chemical properties like mass, density and reactivity.
Isotopes of an element have atoms that are similar as they have same number of protons and electrons but differ in the number of neutrons. So, the isotopes have atoms that are not similar in all aspects
The existence of isotopes contradictspart of Dalton's original atomic theorybecause he said all atoms of a given element are identical have the same mass size and chemical properties



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